{"cve":"CVE-2025-40166","nvd":{"published":"2025-11-12T11:15:46.880","modified":"2026-10-19T21:10:00.160","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/guc: Check GuC running state before deregistering exec queue\n\nIn normal operation, a registered exec queue is disabled and\nderegistered through the GuC, and freed only after the GuC confirms\ncompletion. However, if the driver is forced to unbind while the exec\nqueue is still running, the user may call exec_destroy() after the GuC\nhas already been stopped and CT communication disabled.\n\nIn this case, the driver cannot receive a response from the GuC,\npreventing proper cleanup of exec queue resources. Fix this by directly\nreleasing the resources when GuC is not running.\n\nHere is the failure dmesg log:\n\"\n[  468.089581] ---[ end trace 0000000000000000 ]---\n[  468.089608] pci 0000:03:00.0: [drm] *ERROR* GT0: GUC ID manager unclean (1/65535)\n[  468.090558] pci 0000:03:00.0: [drm] GT0:     total 65535\n[  468.090562] pci 0000:03:00.0: [drm] GT0:     used 1\n[  468.090564] pci 0000:03:00.0: [drm] GT0:     range 1..1 (1)\n[  468.092716] ------------[ cut here ]------------\n[  468.092719] WARNING: CPU: 14 PID: 4775 at drivers/gpu/drm/xe/xe_ttm_vram_mgr.c:298 ttm_vram_mgr_fini+0xf8/0x130 [xe]\n\"\n\nv2: use xe_uc_fw_is_running() instead of xe_guc_ct_enabled().\n    As CT may go down and come back during VF migration.\n\n(cherry picked from commit 9b42321a02c50a12b2beb6ae9469606257fbecea)","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/2c6e5904c5bdbac8e0eadee40f70c42bb83f6dc6","https://git.kernel.org/stable/c/9f64b3cd051b825de0a2a9f145c8e003200cedd5","https://git.kernel.org/stable/c/fa708415566bbe5361c935645107319f8edc8dc1"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2025-40166","score":0.00151,"percentile":0.04197,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}